Diphenylbenzidine
二苯基联苯胺
🗣️ 情景例句
When he came to the States five years ago, he had only forty dollars in his pocket.
五年前他来美国时，口袋里只有40美元。
I'd met Stone several times before.
以前我见过世通几次。
I have often tried to conceive of what those pages might contain,
我常常试图想像这些纸上所写的东西，